Re: fringe arrow conflict between compile and gud?

[Richard Stallman]

    It is not good to always have next-error-overlay-arrow in
    overlay-arrow-variable-list even when no compilation was started.
    This may slow down redisplay and in any case is completely useless
    until compilation/grep is started.

Please find out whether it is a significant slowdown.  If it is, we
will do something about it.  In the mean time, please do this the way
that is cleaner.

There are a thousand *possible* slowdowns for ever *real* slowdown.
Therefore, "this may slow down XYZ" is not enough reason not to do
something.  Please determine whether a slowdown is substantial before
you present it as an argument gfor a design decesion.